MR. LUBBOCK ON THE THYSANURA. 591 



simple hairs and scales. Antennae very long, four-jointed, the two terminal seg- 

 ments ringed. Eyes seven in number on each side. 



6. Lepidocyrtus, Bourlet {Cyphoderus, Nicolet). Abdominal segments unequal, with 



simple hairs and scales. Antennae long, four-jointed. Eyes eight in number on 

 each side. 



7. PoDiiEA. Abdominal segments subequal; hairs simple, no scales. Antennse four- 



jointed, shorter than the head. Eyes eight in number on each side. Saltatory 

 appendage of moderate length. 



8. AcHORUTES, Templeton. Abdominal segments subequal. Antennae short, four-jointed. 



Eyes eight in number on each side. Saltatory appendage quite short. 

 These two latter genera, or subgenera, differ only in the form and size of the caudal 

 appendage, a point, however, of special importance in this group of animals. Templeton, 

 indeed, calls the fork " obsolete ;" but it is present, though small. We thus pass 

 naturally to the LipuridcB, in which it is altogether absent. This small family contains 

 as yet only two genera, Lipura (Burmeister), in which the mouth is composed of the 

 same parts as those in the preceding genera, and Anoura (Gervais), in which the mandi- 

 bles and maxillae disappear. 



Orchesella. 



Orchesella eilicornis. Temp. My specimens were not so green as those of Templeton, 

 and in the colouring of the antennae they agreed more closely with his figure than 

 with his description. The two small basal segments and the small fourth segment 

 were black ; the third had the basal half brown, the apical white ; the fifth, on the 

 contrary, was palest at the base ; the two terminal segments were pale, but not 

 greenish. Body black, more or less weakened by greenish brown ; the mesothorax 

 has two pale oval spaces converging in front, and leaving a triangular central space, 

 and the margins dark ; the metathorax and first abdominal segment have also on 

 each side a pale band, which are, as it were, continuations of those on the mesothorax. 

 Posterior half of second abdominal segment white, with a greenish tinge. Third 

 abdominal segment very dark, especially in front, and with a lunate greenish patch 

 at the centre of the posterior margin. Eourth abdominal segment with a white 

 lateral spot at the posterior margin. Legs annulated with light and dark brown. 



The abdominal hairs are, in Templeton's figure, curved backwards ; in my specimens 

 they stood out straight. 



Length yth of an inch. 



Common throughout the year, under logs of wood. 



Orchesella fastuosa, Nicolet. M. Nicolet's description of this species is as follows : 

 — " Corps cylindrique ; moitie sup6rieure du second article des antennes, quatrieme 

 segment du corps et deux bouquets de polls a I'extr^mit^ posterieure du sixieme 

 d'un blanc tres-pur. Les deux segmens thoraciques bruns, avex quatre taclies ob- 

 liques et une ligne m^diane d'un beau jaune clair au premier, et d'un jaune fence 



VOL. XXIII. 4 K 



